This March recorded the lowest particulate matter (PM2.5) levels-fine, respirable pollutants-in the past four years. While this could seem like a relief at the moment, scientists at the Indian Institute of Tropical Meteorology (IITM) say pollution levels are becoming increasingly unpredictable because of erratic meteorological conditions. The average monthly PM2.5 level dropped to 72 microgram per cubic metre this year from 112 (approximately) in March 2012.Scientists that analyzed the data said the extreme pollution event in 2012 could be linked to the dust storm in the Gulf that time. "The 2012 event was like the Saharan dust cloud that has covered England. This year, winds are blowing from cleaner places at a relatively high speed and have swept away the pollutants.

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